Phototelegraphy.



T. T, BAKER.

PHOTOTELEGRAPHY.

' APPLICATION FILED JAN. 20, 1910.

1,026,297. Patented May 14, 1912 'BAKEIE, a, sabjeet c'f the graphs it has not 'UNETE D WHCFMAfi THEZFEiHE Emu To (155 2 2? may oanc'em:

Be it known L "K116245518 T I ing of @rw 15 Gms'venm: Gm'eimm in the csun'ty 0f izii'iddlesex, England, have invented Remain new and ma 152E Improvements in Plwtnteiegz aphy 0% which the foflnwing is speazificatinn.

Tfhis invention relates to pha-tsiteiegmphy, thechief object "being to enable half mne photographs at thetransmitting stat-ion 0306 reprnducfid directly at the receiving staiion with sharp definition. 1

Heretofore ill conneclsion with the @5 30 .trical transmission and. reception of plantsbeen practicable to reproduce the'photngraph directly n01" with sufiiciemt distinctneasjo enable saiisifacm'y half tmeiwr'mcis t0 be :zlitaine. For by si'anma in; Ehe Kern or the Belin mqeiving a-pparafii it as 'phoingmph imnsmitimi is repmc" *qeifi upon photographic fiim "which has in blfjdeveloped befnre the animal 351mb graph is seen. Mammal the int zit j he H2? falls upon the 911-: i'aphe film mm which 533% phoi'ogmph is being produced is regulated by means 01 a shuflzer or mining which is sat-flashed '0 fine and is actuated to an ardent cfirmspundim; to the sfrengfil If flw summit irazzsn'litia along the line. When half tone phfis graph is used at the transl'nit alzxtinm the interruptions 0f the flurmnt trans- :u n, residing 21% mitbed a iong the line 411 very mp??? nwizag to the mu'nerous lines on the; p

the transmitting station. Consequently the wires, in whicl'ftheshutter or mirror is Fri;- taohed, are set 111 vlbmtlon and defiulie 1% quencxes; 0ivlbmtmn are attained, hmh

take some time toplie out when ih? causa of the vim'z-mion bsases'. Hence blank sparws in the 'pho ugmp, at the transmitting sta tion are not reproduced Wih swbisfnctory i'ha-rpness the receiving stating anf. the photograph reproduced therehas :TJ blurrw. appamnce. Y v

In the present invantion, themateriai on the surface 01 which the half time photegraph is'to be reproduced is thaikind that can be discolored by the action of an electric current passing through it; and he electric current arriving 4-1: the receiving station from ihe sfiaticsn at which the phutogmph to be rcproduce is causing interruptisns of the eiectiic durrent is-di rectly utilized for this purpose. This electrical method muses thez'rri eisra J l Min mm gar swat 3 ken? V ed a inixsrmpmd a rem, is he transmitted, cause flu iscofiming nmrim on the waiving suz'faca 5:0 Kr-sf siiongate distorted and thus mmprweirsiia sharp iafinit-ion from being; obtained; 1 'thm'efmfe, meordifigtb the pmes-- em; inventian, mbviate this tendency by pzmsing along the line & steaflyingy 01" 002mm? acting current from this I'QCdU'LHg station after each inten'nptim'l 0i 511a line cur in the GEJPUSZZU'E directian in that in which Gm hm {IUFFTQH ."a'veifit m the raceiving stacan(Hamming Currant may he 196i as mat is mmmiim m: 05 3. 1 hoingr 1 :upun .Lh mQssiorn or ne mms a aepm-(iufied; this imp [he v by 11m swam) 3316 sizes 01? Hm pzv r'. in swam-mamawiah the 1" 0f calming (lififlfiilf pal-$3 01" the photogzy 911 .10 be iwmsmitixsd. This ii'npz'sicm 02? negative is pressed mm the surface of the lead foii 01" s'heeif suflicieniily to obtain a smwih surfime, The circuit 01'? the battery or uthw sonrca m: electric cumerzfi'ai: trm fimnsmifiing station is cm'npieted thmugh ma iemi fail a stylus beari. p W -m1 mwface, and (W7 iagainst Sm qimsaid on the Emd neaih the paint .1 esmfibed. Z iemfi may fie. sailed at the transm Jug sta'tim um Ehe sansiiimd paper or the like at EH45 receiving? statian, aremuunneci 'ei gmn revolving drurmg and! means are pmvi ied whereby the rota-- tinn of'the trmlsmitfing drum witsmaflcflly i1 tmem'ls $10 prmimition nut. in. :w

on the transmitting drum.

. of means c out of contact with 'tric current therethrough,

traveling over a blank space To enable the receiving drum B to be stopped without stopping the driving mechanism the driving shaft (Z is connected to the spindle of the said drum tl'irough a friction clutch D. The stopping mechanism may comprise .a stop D suitablymounted to act in conjunction with a projection or tooth l)" on the drum B, and a tooth 1') adapted simultaneously to depress the spring contact arm the contact and into contact with the contact At the moment when the transmitting drum A completes its revolution, a projection A on the said drum A depresses the lever A and thereby causes the contact pieces A" and A to move away from the stationary contacts E, E and into contact with the contacts E and E This movement of the lever A reverses the direction of the current passing into the line from the battery A; this reverse line current flows through a polarized relay D owing to the spring contact arm 0'' being in the result that the relay tongue D moves to close the circuit of a local battery I), the current from which magnet D which thereupon effects the removal of the stop I) from the path of the projection D on the drum B. The drum is then free to rotate before.

What I claim and desireto secure by Letapparatus is ters Patent of the United States is z- 1. In a phototelegraphic system, the combination with a source of electric current,

at a transmitting station for interrupting the current for of time corresponding to the variations of light and shade at different parts of the photograph to be transmitted, a sheet of material at a receiving'station' capableof being discolored by the passage of an elecmeans for enabling the interrupted passage of the current transmitted along the line to be recorded on the surface of the material by its discoloring effect, and at the receiving station for sending a current along the line,

after each interruption of the line current, in the opposite direction to that In which the line current traveled to the receiving station.

2. In a bination with a source of electric current,

0t means at a transmitting station for in-- contactwith the contact 0, with energizes the electro-,

different. periodsphototelegraphie system,-the coiu- 'bination in series at the of time corresponding to the variations of light and shade at different parts of the photograph to be transmitted, chemically prepared paper at a receiving station capable of being discolored by the passage of an electric current therethrough. a stylus having its point riding upon the paper and connected in circuit uith the line, means for producing relative movement l'ietween the paper and the stylus, and means at the receiving station for sending a current along the line, after each interruption of the line current, in-the opposite direction to that in which the line current traveled to the receiving station.

3. In a phototclegraphic systei'u, the comwith a'source of electric current. of means at a transmitting station forinterrupting the current for different periods of time corresponding to the variations of light and shade at different parts of the photograph to be transmitted, a sheet ofnnaterial at a receiving station capable of being discolored bythe passageof an electric cur rent tl'lerethrough, means for enal'iling the interrupted passage of the current'transrnitt'ed along the line to berecorded on the surface of the material by itsdiscoloring effect, a battery and a variable resistance nected in shunt upon the line, and a variable condenser connected in shunt upon the said battery 7 t. Ina phototelegraphicsystem, the com bination With a source of electric current,

of means at a transmitting station for interrupting the current for different periods of'time corresponding to the variations of light and shade at different parts of'the photograph to be transmitted, chemically prepared paper at a receiying station capabio of being discolored by an electric current therethrough, a stylus having its point riding upon the paper and connected in circuit with the line, a battery and a variable resistance in series at the receiving station and connected in shunt upon the line, and a variable condenser connected in shunt upon the said battery.

In testimony whereof I aflix my signature in presence of two witnesses.

(THOMAS THORNE BAKER. lVitnesses: V

T. SELBY WARDLE, \VALTER J. SKERTEN.

receiving station and conthe passage of 

